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Home >> Ford >> 2000 >> Taurus LX, 3.0 2, AX4N >> Repair and Diagnosis >> External Pages >> Different car >> Section 186 (Information Center -- F250-F550 Super Duty) >> Diagnosis And Testing >> Information And Message Center >> Pinpoint Tests >> Pinpoint Test B: The Compass Is Inoperative

Pinpoint Test B: The Compass Is Inoperative

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
  1. B1 CHECK CIRCUIT 640 (RD/YE) FOR VOLTAGE 
    • Key in OFF position.
    • Disconnect: Compass Sensor Module C909.
    • Key in ON position.
    • Measure the voltage between the compass sensor module C909-2, circuit 640 (RD/YE), harness side and ground.
      Fig 1: Checking Circuit 640 (RD/YE) For Voltage
      G03902623Courtesy of FORD MOTOR CO.
    • Is the voltage greater than 10 volts? 
    • Yes  : GO to B2.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  2. B2 CHECK CIRCUIT 676 (PK/OG) FOR AN OPEN 
    • Key in OFF position.
    • Measure the resistance between the compass sensor module C909-1, circuit 676 (PK/OG), harness side and ground.
      Fig 2: Checking Circuit 676 (PK/OG) For Open
      G03924783Courtesy of FORD MOTOR CO.
    • Is the resistance less than 5 ohms? 
    • Yes  : GO to B3.
    • No  : REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.
  3. B3 CHECK CIRCUIT 702 (WH/BK) AND CIRCUIT 703 (WH/OG) FOR AN OPEN AND A SHORT TO GROUND 
    • Disconnect: Instrument Cluster C220a.
    • Measure the resistance between the compass sensor module C909-3, circuit 703 (WH/OG), harness side and the instrument cluster C220a-18, circuit 703 (WH/OG), harness side; and between the compass sensor module C909-3, circuit 703 (WH/OG), harness side and ground.
      Fig 3: Checking Circuit 702 (WH/BK) And Circuit 703 (WH/OG) For Open And Short To Ground (1 Of 2)
      G03924784Courtesy of FORD MOTOR CO.
    • Measure the resistance between the compass sensor module C909-4, circuit 702 (WH/BK), harness side and the instrument cluster C220a-19, circuit 702 (WH/BK), harness side; and between the compass sensor module C909-4, circuit 702 (WH/BK), harness side and ground.
      Fig 4: Checking Circuit 702 (WH/BK) And Circuit 703 (WH/OG) For Open And Short To Ground (2 Of 2)
      G03924785Courtesy of FORD MOTOR CO.
    • Are the resistances less than 5 ohms between the compass sensor module and the instrument cluster, and greater than 10,000 ohms between the compass sensor module and ground? 
    • Yes  : INSTALL a new compass sensor module. SET the zone. REFER to COMPASS ZONE ADJUSTMENT . CALIBRATE the compass. REFER to COMPASS CALIBRATION . TEST the system for normal operation.
    • No  : REPAIR the circuit in question. TEST the system for normal operation.
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